Hydraulic elevator



' NITED STATES PATENT OFFICE.

JAMES W. SEE, OF HAMILTON, OHIO, ASSIGNOR TO FRED W. GORDON, F PITTSBURG, PENNSYLVANIA.

HYDRAULIC ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 233,286, dated October 12, 1880.

Application filed August 12, 1880. (No model.)

To all whom it may concern Be it known that I, JAMES W. SEE, of Hamilton, Butler county, Ohio, have invented certain new and useful Improvements in Hydraulic Elevators, of which the following is a specification.

My invention pertains to means for economizing in water used in hydraulic elevators by adjusting the consumption of water to suit the load to be handled.

My invention consists of a lever placed at a point somewhere between the hydraulic piston and the pulling-point of the hoisting-rope, and arranged with a shifting power-point or a shifting fulcrum, so that the velocity ratio existing between the piston travel and the rope travel may be altered.

The accompanying drawing represents a hydraulic hoisting device having my improvement incorporated into it. The figure is a side elevation.

A is the hydraulic cylinder, having a piston, B, piston-rod U, crosshead D, and connecting-pipe L. The pipe L should be provided 2 with the usual valve or valves for controlling the flow of water to and from the cylinder.

H represents the movable sheave-head of a common multiple-sheave rope hoisting-machine, the ropes J being supposed to pass to the stationary sheave-head, as usual.

In ordinary hoisters of the multiple-sheave type .the movable sheave-head is fitted to slide in guides, and is actuated by the piston-rod of the motor, said rod being attached directly 3 5 to the movablesheave-head.

One feature of my invention consists in mounting the movable sheaves upon a lever, as shown. The lever is pivoted at one end, and the piston of the motor actuates the lever 40 through the medium of rods E, as shown. By thus rocking the sheave-head instead of sliding it, sliding surfaces may be dispensed with entirely by suppressing the cross'head and pivoting the connecting-rod directly into 4 5 the piston of an open-ended cylinder.

With other objects in view, I prefer to use a cross-head in connection with a sheave-lever, as will be set forth.

In the figure the connecting-rods E are shown as being pivoted to the cross-head D and to a power-block, F, fitted to slide upon the lever G.

It is obvious that by adjusting the position of the block F upon the lever G the velocity ratio existing between the piston travel and 5 5 the rope travel may be altered. The travel distance of the rope remaining unaltered, the piston travel, and consequently the consumption of water, may be adjusted to suit the load to be moved.

The lever may be arranged in many difl'erent forms and positions and still come within the scope of my invention.

The nest of movable sheaves is not essential to my invention, it being obvious that a sin- 6 gle hoisting-rope attached directly to some point on the adjusting'lever would serve the purpose, provided the relation of piston velocity and rope velocity could be thus properly adjusted to suit the case in hand. The nest of sheaves is simply a multiplier of velocities, and a properlyproportioned lever, it admissible, would efiect the same purpose. Furthermore, the fulcrum or the transmittingpoint may be arranged to shift instead of the power-point, and thus alter the ratio.

I claim as my invention 1. In a multiple-sheave hoisting device, the combination, with a fixed cylinder, a piston, and a fulcrum, of a lever pivoted to said ful- So crum, and adapted to serve as a housing and to carry the movable sheaves, and one or more connecting-rods adapted to transmit motion from the said piston to the said lever, substantially as set forth.

2. In a hydraulic hoisting device, the combination, with a fixed cylinder, a piston, a means for transmitting motion from said piston to a lever, and a fulcrum, of an oscillating lever pivoted to said fulcrum, connected with a hoisting-rope connected with said means for transmitting to it motion from said piston, and provided with means for altering the relative positions of said fulcrum to both or either of its counectingpoints, substantially as set forth.

JAMES W. SEE.

Witnesses NELsoN WILLIAMS,

Jim. R. WooDs. 

